JPH03113884A - Disk cartridge - Google Patents

Abstract

PURPOSE:To improve the durability and the quality of a disk by forming a projecting part on the peripheral edge side of a head insertion hole on the inside surface of a half, and welding a root part of the head insertion hole side of this projecting part and a circumferential edge part of a notch part of a liner sheet. CONSTITUTION:On the circumferential edge sides of a head insertion holes 10, 11 of the inside surfaces 1a, 2a of the upper and the lower halves 1, 2, projecting parts 1b, 2b are projected and formed integrally so as to run along the longitudinal direction of each head insertion hole 10, 11. A root part 20 of each head insertion hole 10, 11 side of each projecting part thereof 1b, 2b and a circumferential edge part of notch parts 12, 13 of a pair of liner sheets 5, 6 are welded, respectively. Accordingly, it is prevented that a welded part to the halves 1, 2 of the circumferential edge side of the notch parts 12, 13 of the liner sheets 5, 6 comes into contact directly with a recording area of a disk 4. In such a way, the durability and the quality can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk cartridge in which a liner sheet made of a fiber material is interposed between a disk and a half made of, for example, a magnetic sheet.

[Summary of the Invention] The present invention comprises an upper and a lower half in which a disk is rotatably housed, a cartridge having a rectangular head insertion hole in at least one of the upper and lower halves, and a cartridge having a rectangular head insertion hole in at least one of the upper and lower halves; and a liner sheet interposed between a liner sheet and one surface of the disk facing the one half, the liner sheet having a notch corresponding to the head insertion hole. A protrusion is formed on the inner surface of the head insertion hole on the peripheral edge thereof so as to protrude along the longitudinal direction of the head insertion hole, and the root portion of the protrusion on the head insertion hole side is connected to the peripheral edge of the notch of the liner sheet. By welding, it is possible to prevent the welded part of the liner sheet with the half on the notch side from directly contacting the recording area of the disc at a low cost, further improving the durability and quality of the disc. It is designed so that it can be done.

[Prior art] For example, Utility Model Application Publication No. 61-149179 and Utility Model Application Publication No. 6
Disc cartridges are disclosed in Japanese Patent No. 1-182969.

The disk cartridge disclosed in the above-mentioned Japanese Utility Model Publication No. 61-149179 will be explained in detail with reference to FIGS. It is made of synthetic resin, and
A floppy disk (hereinafter simply referred to as disk) 4 is rotatably housed in a cartridge 3 consisting of a lower half 1.2, and a floppy disk 4 is placed between the inner surfaces 1a and 2a of the upper and lower halves 1.2 and the disk 4. , a pair of upper and lower liner sheets 5.6 are interposed.

A center core 7 made of a metal disk is fixed to the center of the disk 4, and the center core 7 is provided with a center hole 8 and an eccentric hole 9. Also, above,
The lower half 1.2 is provided with a rectangular head insertion hole 10.11, and the pair of liner sheets 5, 6 corresponding to both head insertion holes 10.11 have cutouts 12,1.
3 are provided respectively. These head insertion holes 10 and 11 are opened and closed by a shutter 14.

Further, a circular hole 15 for inserting a turntable is provided in the center of the lower half 2. Furthermore, circular holes 16.degree. 17 are provided in the central portions of the pair of liner sheets 5.6 at positions corresponding to the circular holes 15.

The pair of liner sheets 5 and 6 are made of a so-called non-woven fiber material made of long fibers such as polyester, polyethylene, rayon, etc., made into a sheet by heat-pressing or other methods. Inner surfaces 1a of the upper and lower halves 1 and 2.

2a by welding. That is, in the pair of liner sheets 5 and 6, the periphery of the notch 12.13 of each liner sheet 5 and 6 is aligned with the periphery of the head insertion hole 10.11 of the upper and lower halves 1 and 2. A plurality of strips, for example two linear patterns 22 and 23, are welded at intervals in the direction. Then, the upper and lower halves 1 and 2 are joined from above to the cartridge 3.
When assembled, the pair of liner sheets 5 and 6 are always in contact with the upper and lower recording surfaces of the disk 4.

In order to increase the contact pressure of the pair of liner sheets 5.6 against the disk 4, the lid plate 18 may be made of an elastic sheet material such as a synthetic resin sheet, or may be bonded to the inner surface 2a of the lower half 2. The lifter plate 1 is fixed with
8, a part of the lower liner sheet 6 is elastically pressed from below against the lower surface of the disk 4 over substantially the entire width R of the recording surface of the disk 4 in the radial direction.

In addition, in the portion where the lifter plate 18 is arranged, the lower liner sheet 6 is not welded to the lower half 2, so that the liner sheet 6 is easily floated.

When this disc cartridge is used, the center hole 8 and eccentric hole 9 of the center core 7 are engaged with a center pin on the turntable of the disc player and a drive bin (neither of which is shown), and the drive bin engages with the center hole 8 and eccentric hole 9 of the center core 7. The disk 4 is driven to rotate, and the upper and lower recording surfaces are selectively recorded by a pair of upper and lower recording/reproducing heads (not shown) that are in contact with the upper and lower recording surfaces of the disk 4 through both head insertion holes to, 11 and both cutout portions 12, 13. Or played.

During this use, the upper and lower recording surfaces of the disk 4 are constantly in contact with both liner sheets 5 and 6 and are driven to rotate, and the center of the disk 4 is moved to the turntable using the load torque caused by the frictional force. centered. Also,
When the disk 4 rotates, both liner sheets 5 and 6 perform cleaning to wipe off dust adhering to the upper and lower recording surfaces of the disk 4 and friction powder generated by contact between the disk 4 and the recording/reproducing head. In addition, both the liner sheets 5,
A plurality of straight line patterns 22.23 spaced apart in the rotational direction of the disk 4 are formed on the periphery of the notch 12.13 of No. 6 on the upper side and on the periphery of the head insertion hole 10.11 of the lower No. 1-71, 2. Since they are welded together, fibers do not tangle from the periphery of the notches 12.13 of both liner sheets 5.6, and a dropout phenomenon during recording or reproduction caused by this fiber waste is prevented.

Further, FIG. 9 shows a cross section of a main part of the disk cartridge disclosed in the above-mentioned Japanese Utility Model Publication No. 61-182969.

on this disk cartridge.

The upper and lower halves l' of a pair of upper and lower liner sheets 5' and 6' whose peripheral edges are welded to the inner surfaces of the lower halves 1' and 2',
The portions near the head insertion holes io' and tt' of 2' bulge and protrude toward the disk 4' side (these bulges are denoted by reference numeral 5a).
Z6a'), and each bulge 5a
', 6a' are adapted to hold the disc 4. This prevents vibrations such as surface runout during rotation of the disk 4' from the bulges 5a of each of the liner sheets 5' and 6'.
', 6a' is absorbed by the elastic force of the disc 4', and eliminates fluctuations in pressure contact with the head caused by inadvertent vibration of the disc 4', poor head contact, etc., and eliminates the loss of information signals during recording and reproduction of the disc 4'. We provide highly reliable disk cartridges that prevent (soft errors).

[Problems to be Solved by the Invention] However, in the conventional disk cartridge of Utility Model Application Publication No. 61-149179, the peripheries of the cutout portions 12 and 13 of the pair of liner sheets 5 and 6 are separated from the upper half 1, the lower half 1,
2, each pattern 22.23 is fixed to the periphery of the head insertion hole 10.11 of the inner surface 1a, 2a of 2a by heat or ultrasonic welding. intersects the recording area of the disk 4, so when the disk 4 rotates, the disk 4 and the welding patterns 22 and 23 tend to come into contact with each other, resulting in decreased durability of the disk 4 and loss of information signals during recording and reproduction ( There was a concern that a soft error might occur.

In addition, when assembling the disk cartridge, the liner sheet 5
, 6 are not set completely, the thermal heater will directly touch the upper and lower resin halves 1 and 2, and the respective halves 1 and 2 will be damaged.
melted, and an abnormal bulge of melted resin and a large number of strings of resin were generated on the outside of the welding patterns 22 and 23 of each half 1 and 2, leading to a decrease in the durability of the cartridge 3 and soft errors.

Furthermore, when recording and reproducing the disc 4, the upper part.

Lower half 1. There is too much space inside the head insertion hole 10.
Due to vibrations such as surface runout, reliable recording and recall of information (data) on the disk 4 was incomplete.

Note that the head insertion hole 10.11 is located at the top.

Since the peripheral parts of the lower halves 1 and 2 are particularly thin, the head insertion holes of the upper and lower halves 1 and 2 are damaged by heat during molding of the upper and lower halves 1 and 2, and heat welding of the liner sheets 5 and 6. to, 11
Deformation such as warpage occurs in the peripheral portion of the shutter 14, and slide function failure of the shutter 14 is likely to occur in a subsequent process.

Further, in the conventional disk cartridge disclosed in Japanese Utility Model Application Publication No. 61-182969, the bulge portion 5a' absorbs vibrations such as surface runout during rotation of the disk 4'.

Since the liner sheets 5' and 6' must be formed in a bulging manner, the manufacturing cost of the liner sheets 5' and 6' increases accordingly, resulting in a disadvantage that the overall cost increases.

SUMMARY OF THE INVENTION Therefore, the present invention provides a disc cartridge that can prevent the welded portion of the liner sheet and the half from coming into direct contact with the recording area of the disc at a low cost, and further improve the durability and quality of the disc. be.

[Means for Solving the Problem] A cartridge consisting of an upper and a lower half in which a disk is rotatably housed, a cartridge having a rectangular head insertion hole in at least one of the upper and lower halves, and the above-mentioned one half. and a liner sheet interposed between the one surface of the disk opposite to the one half and having a notch corresponding to the head insertion hole. A protruding portion is formed on the inner surface of the cover on the peripheral edge side of the head insertion hole so as to protrude along the longitudinal direction of the head insertion hole, and the root portion of this protrusion on the side of the gutter insertion hole and the notch of the liner sheet are formed. The peripheral edge part of the part is welded.

[Function] Since the root portion of the protruding portion protruding from the inner surface of the half on the head insertion hole side and the peripheral portion of the notch of the liner sheet are welded, the welded portion with the half on the peripheral side of the notch of the liner sheet direct contact with the recording area of the disc is prevented at low cost, and the durability and quality of the disc are significantly improved.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings. Note that parts having the same configuration as those of the conventional example shown in FIGS. 5 to 8 are given the same reference numerals, and the explanation thereof will be omitted.

FIG. 1 is an exploded perspective view of a disk cartridge using a micro-floppy disk made of a 3.5-inch magnetic sheet or the like according to an embodiment of the present invention. This disk cartridge, like the conventional example, consists of upper and lower halves 1 and 2 made of synthetic resin in which a disk 4 is rotatably housed.

A cartridge 3 having a rectangular head insertion hole 10.11 in the lower half 1.2, inner surfaces 1a, 2a of the upper and lower halves 1.2, and the upper and lower halves l.

A pair of upper and lower liner sheets 5.6 are interposed between the recording surfaces of the disk 4 facing the recording surface 2 and have a notch 12.13 corresponding to the head insertion hole 10.11.
It is equipped with

Projections 1b are provided on the peripheral edges of the head insertion holes 10.11 on the inner surfaces 1a and 2a of the upper and lower halves 1.2.

2b are integrally molded to protrude along the longitudinal direction of each of the head insertion holes 10, 11. As shown in FIG. 2-3, each head insertion hole 10 of each protrusion 1b, 2b
．． 11 side root portion 20 and the above pair of liner sheets 5
, 6 are welded to the peripheral edge portions of the notches 12 and 13 by a predetermined means of ultrasonic waves (the welded portions are indicated by reference numeral 19 in FIG. 2). In addition, each root portion 21 of each of the protrusions 1b, 2b opposite to the root portion 20 and the peripheral edge portion of the notch i12.13 of the pair of liner sheets 5.6 are welded by a predetermined ultrasonic means. It is.

As a result, each of the above-mentioned protrusions 1b.

The peripheral edge portions of the notches 12 and 13 of each liner sheet 5.6, which correspond to the peak portions of the liner sheets 2b, are not welded.

According to the disk cartridge of the above embodiment, as shown in FIG. 4, the cutout portions 12.
13 and the inner surfaces 1a and 2 of the upper and lower halves 1.2
Each protrusion 1b protrudes from a.

Since the base portions 20 and 21, which are the welded portions of 2b, do not directly contact the recording area of the disk 4 when the disk 4 rotates, it is possible to improve the durability of the disk 4 and to prevent soft errors. It is possible to significantly increase product I self-security by reducing the

Further, each of the protrusions 1b of the upper and lower halves 1 and 2.

Since the recording area of the disk 4 is forcibly cleaned on the peripheral edge side of the notch 12.13 of each liner sheet 5, 6 corresponding to the protrusion of the liner sheet 2b, soft errors can be reduced as much as possible. .

Furthermore, each of the protrusions lb of the upper and lower halves 1 and 2.

Notches 12.1 in each liner sheet 5, 6 corresponding to 2b
3, it is possible to suppress and reduce vibrations such as surface runout of the disk 4 within the head insertion hole 10.11 that occurs when the disk 4 rotates, and highly reliable recording and reproduction can be obtained. can. Furthermore, since it is possible to improve the reliability of the dropout check during manufacturing and maintain quality assurance during use, it is possible to reliably prevent dropout phenomena during recording and reproduction.

Furthermore, each of the protrusions 1b on the upper and lower halves 1.2,
2b should be made to protrude by integral molding, and the mold for molding each half 1.2 should also be made to protrude from each of the above-mentioned protruding parts 1b12b.
It is economical because it can be done by simply digging the part facing the , and the manufacturing cost can be kept low.

Furthermore, since each of the protrusions 1b and 2b functions as a rib, the curvature of the peripheral portions of the head insertion holes 10 and 11 of the thin upper and lower halves 1 and 2 where the head insertion holes to and it are located is prevented. It is possible to prevent such deformation, and it is possible to reliably prevent the occurrence of defects in the sliding function of the shutter I4 in a subsequent process.

Incidentally, according to the above embodiment, a pair of liner sheets were arranged on the upper and lower sides of the disk having recording surfaces on the upper and lower sides, respectively.
When using a disk in which a recording surface is formed only on one side of the disk, a liner sheet may be welded only to one side of the recording surface of the disk in the same manner as in the above embodiment.

Further, the disk is not limited to a floppy disk, and may be applied to disk cartridges of various recording and reproducing methods using disks made of various materials. Furthermore, one protrusion was added on both sides of the periphery on the head insertion hole side of the inner surface of each half.
Although each book is formed to protrude, the number of protrusions is not limited to one at a time, and a plurality of books may be formed to protrude at a time.

[Effects of the Invention] As described above, according to the disk cartridge of the present invention, a protrusion is formed on the inner surface of the half on the peripheral side of the head insertion hole so as to protrude along the longitudinal direction of the head insertion hole. Since the base part on the head insertion hole side of the liner sheet and the peripheral edge part of the notch in the liner sheet are welded, the welded part with the half on the peripheral edge side of the notch in the liner sheet directly connects to the recording area of the disk. It is possible to prevent the disc from coming into contact with the disc at a low cost, and the durability and quality of the disc can be further improved.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a disk cartridge showing an embodiment of the present invention, FIG. 2 is a perspective view of the lower half of the disk cartridge, and FIGS. 3 and 4 are sectional views of essential parts of the disk cartridge. , FIG. 5 is an enlarged plan view of the main parts of the conventional example, FIG. 6 is a sectional view taken along the line Vl-VI in FIG. 5, FIG. 7 is an exploded perspective view of the conventional example, and FIG. 8 is an exploded perspective view of the conventional example. A plan view of the lower half and FIG. 9 are sectional views of main parts of another conventional example. 1, 2...upper, lower half, la, 'la-inner surface,
Ib. 2b... Projection portion, 3... Cartridge, 4... Disk, 5.6... Liner sheet, 10, 11-- Head insertion hole, 12.13... Notch, 20... The base of the protrusion on the head insertion hole side. 2. FIG. 4. An enlarged plan view of the main parts of the conventional example. Figure 9

Claims (1)

[Claims] (1) A cartridge consisting of an upper and a lower half in which a disk is rotatably housed; a cartridge having a rectangular head insertion hole in at least one of the upper and lower halves; A disk cartridge including a liner sheet interposed between one surface of the opposing disk and having a notch corresponding to the head insertion hole, the periphery of the head insertion hole on the inner surface of the one half. A protruding portion is formed on the edge side so as to protrude along the longitudinal direction of the head insertion hole, and a root portion of the protruding portion on the head insertion hole side is welded to a peripheral portion of the cutout portion of the liner sheet. disc cartridge.